Hey Carlos,
Don't worry, Virtualmin GPL is still being actively maintained. You've just followed a (very) old link. Our pace of development is very rapid, so links to specific versions of the package are gonna go stale very quickly.
You can always find the latest GPL version here:
http://www.webmin.com/index8.htmlThe download link is in the upper right corner. You may note that the version available there is the very same version number we are distributing in the Professional product (minus a few Professional-only features)--GPL is in very active development, just like Professional. We want to keep our Open Source users happy, too.
And feel free to talk to us here in the forums about any problems you might have getting it running or using it once installed. We're all happy to talk about both versions of the product--though you should generally mention that you're using GPL, so we won't assume you're using our defaults and our install.sh to set things up.